Joseph c



( No Model.) Q

' J. C. HIGGINS 82 T. LEA. EXPANSIBLE HORSBSHOE GALK.

No. 477,542. PatentedJune 21, 1892.

ATTORNEY.

UNITED STATES PATENT OFFICE.

JOSEPH C. HIGGINS AND THOMAS LEA, OF NEN BRUNSWICK, NEWV JERSEY, ASSIGNORS OF ONE-'IWVENTIETH TO A. VAN NEST BALDWIN, OF SAME PLACE. w

EXPANSIBLE HORSESHOE-CALK.

SPECIFICATION forming part of Letters Patent No. 477,542, dated June 21, 1892.

Application filed November 13, 1891. Serial lie/111,797. (No model.) Patented in France December 8, 1891, lilo. 217,927, and

in Belgium December 31, 1891, No. 97,490. i

To all whom it may concern.- the shoe with apertures 2), each of a size to Be it known that we, JOSEPH O. HIGGINS snugly receive a shank of the calk. We and THOMAS LEA, of New Brunswick, in the usually place two calks at the toe of the shoe county of Middlesex and State of New Jersey, and a calk at each heel; but of course the have invented certain new and useful Imcalks can be arranged as desired. Each calk provements in IIorseshoe-Oalks, (for which consists of the outer contact ends 0, of any patents have been obtained in France, dated suitable and desirable shape,preferably coni- December 8, 1891, No. 217,927, and in Belcal, as shown, although we do not limit ourgium, dated December 31, 1891, N 0. 97,490, selves to this particularshape, and the-shank 10 and for which applications have been filed in cl, of a shape to snugly fit the shoe-aperture. Canada, No. 58,424, dated Novemberld, 1891; The shoulder e is preferably formed at the in England, No. 21,415, dated December 8, base of the shank to bear against the under 1891, and in Germany, No. 11,744, dated Desurface of the shoe. The shank canbe of any cember 8, 1891;) and we do hereby declare desired shape, although we prefer to have it 15 that the following is a full, clear, and exact cylindrical, as shown. Each calk is prefer description of the invention, which Will enably formed integral and in one piece of suit able others skilled in the art to which it apperable hard metal. The shank of the calk is tains to make and use the same, reference bemade expansible, preferably, by one or more ing had to the accompanying drawings, and slits or cuts f, extending longitudinally 2c to the letters of reference marked thereon, through the shank, preferably,a suitable diswhich form part of this specification. tance into the outer portion of the calk. The

This invention relates to certain improveshank can be formed expansible by any dements in horseshoecalks. sired number of slits or cuts from one up.

The object of the invention is to provide an Preferably two slits in planes at right angles 25 improved horseshoe-calk exceedingly simple, to each other are employed, as shown in Fig. cheap, and durable in construction and com- 5. These slits form the shanks of tongues, posed of a minimum number of parts, the priwhich are forced out. The calk is provided mary object being great strength and ease with a central longitudinal passage, preferand secureness of attachment,'whereby when ably extending from. its contact end com- 0 the calk is once secured it will not become pletely throughout its length, to receive the loose, but continued concussion will the more pin 9, and the shape of the expanding-pin firmly lock it in place in the shoe. and interior of this opening are so relatively This invention consists in certain novel feaarranged that when the pin is forced in toward tures of construction and in combinations of the rear or shank end of the calk it forces the 3 5 parts more fully described hereinafter, and sides of the calk under great pressure against 8 5 particularly pointed out in the claims. the sides of the shoe-opening. The expand- Referring to the accompanying drawings, ing-pin is preferably tapered and the portion Figure 1 is a section of the horseshoe, showof the longitudinal opening within the shank ing our improved calk secured in position is preferably contracted, so that the pin passes 40 therein. Fig. 2 is a view showing the calk freely through the outer portion of the open- 0 and its expanding-pin in elevation. Fig.3is ing, but engages the slits of the openings an end View of the calk. Figs. at and 5 are within the shank and forces the sides of the respectively end views of the shanks of two shank out when the pin is forced in. The calks having a different number of slits or expanding-pin extends from the contact end 5 cuts. Figs. 6 and 7 show diiferent forms of of the calk inwardly. Hence all concussions 5 expanding-pins. Fig. Sis a detail View of a caused by the calk striking the ground or tool for removing the calks, shown on a ropavement when in use constantly forces the duced scale. pin up and maintains the shank constantly In the drawings, a indicates a horseshoe. expanded within the shoe-aperture. 0 In carrying out our invention we provide In securing the calks the shank of each calk xoo is inserted in its shoe-aperture, and then the expanding-pin is inserted in the calk from the point thereof and driven in until the shank is firmly and rigidly locked in the shoe, and the greater and heavier the concussions on the point of the calk the more rigidly and firmly it is locked in the shoe. expanding-pin extends longitudinally within the calk, so that it is free to be driven upwardly independently of the shoe as the parts wear or loosen, thereby maintaining the calk constantly locked strongly and rigidly. The expanding-pin can be of any desired shape,

such as round, fiat, or angular in cross-see ing inclosed within the calk, the pin and the portion of the pin-passage within the shank tion, as shown in the drawings.

70 indicates a tool for removing the calks from the shoe without removing the shoe from the hoof. This tool has a beveled edge to be driven between the shoulder of the calks and face of the shoe, and thereby force or prize out the calk. The beveled or wedge-shaped end has a notch or recess, as shown, to fit the shank of the calks.

Having fully described our invention, what we claim as new, and desire to secure by Letters Patent of the United States, is I 1. The calk in one piece, having its shank The" split and expansible, the longitudinal passage through the calk, and the expanding-pin in such passage, combined and arranged to operate as set forth.

2. The calk in one piece, with its shank split longitudinally to render it expansible and having the passage extending longitudinally through the calk and contracted within the shank, and the expanding-pin, combined to operate as set forth.

3. Theherein-described l1orseshoe-callghaving the expansible shank, and the expandingpin extending from the contact end of the calk longitudinally within the same, said pin bebeing so relatively formed by a bulge as to expand the shank as the pin is forced inwardly, substantially as described.

In testimony that We claim the foregoing as our own we affiX our signatures in presence of two witnesses.

JOSEPH O. HIGGINS. THOMAS LEA. Witnesses:

PETER F. DALY, JOHN M. DALY. 

